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三角形内角和
Author:
谢鹏
GeoGebra
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異分母分數減法
畫出對稱圖形
第八周作业
找出對稱軸
兩位數除以一位數（一）
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旋轉
繪圖練習
優良作品5(沛綺)
Q5-7
用交轨法求动点的轨迹方程图.许兴华数学
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Cosine
Rational Numbers
Set Theory
Integers
Linear Functions